When two intermediate chemical equations are combined, the same substance that appears in the same phase can be canceled out, provided that
a) it is a reactant in one intermediate reaction and a catalyst in the other reaction.
b) it is a product in one intermediate reaction and a catalyst in the other reaction.
c) it is a reactant in one intermediate reaction and a product in the other reaction.
d) it is a reactant in both of the intermediate reactions.
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